Re: PostgreSQL, clusters and load-balance

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On Tue, 25 Mar 2008 14:16:37 -0400
"Bill Wordsworth" <bill(dot)wordsworth(at)gmail(dot)com> wrote:

> When traffic goes up, my webserver creates multiple instances of
> postgresql.exe. At some basic level, aren't they similar to Oracle's
> RAC "clusters", except that they are not aware of each other? Does
> this mean that if I were to create copies of postgresql.exe
> beforehand and somehow split traffic to them, traffic could be
> handled better?

Ehh no :).

Each of the postgresql.exe is a forked connection to a specific
database within PostgreSQL. They may be one database (if you only have
one) or many.

You could benefit from connection pooling but I have no idea if we have
a connection pooler that runs on Windows.

>
> Also, if I install postgresql on multiple boxes, how can I
> load-balance- configure traffic to be split depending on load, at
> application or webserver level?

That is a *long* conversation. It entirely depends on your business
requirements.

>
> All this for mostly read-only data.
>
> http://www.postgresql.org/docs/8.3/interactive/high-availability.html

That is correct, you can not have multiple write nodes.

Sincerely,

Joshua D. Drake
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